Pre-Lab 3 Quiz: Lab
4- Preparation of Benzil from Benzoin
Name: _________________ Date:_______________
1. Write the balance equation including nitric acid for the oxidation of benzoin to benzil and how many moles of nitric acid is required for each benzion mole? ( 10 pts).
2. Why this reaction has to be carried out in a fume hood? (10 pts)
3. The UV spectra of benzoin shows a peak at lmax EtOH (247) nm and move to higher lmax EtOH (purple color) when NaOH solution added to a ethanol solution of benzoin. Explain this absorption in terms of benzoin structure(10 pts)
4. How many moles are in 4 g of benzoin? (10pts)
Ans:_____________
5. What is the theoretical yield of benzil starting with 4 g of benzoin? (10 pts)
Ans: __________________